scholarly journals Quality and Yield of Lettuce in an Open-Air Rooftop Hydroponic System

Agronomy ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2586
Author(s):  
Maha Ezziddine ◽  
Helge Liltved
Keyword(s):  
Leaf Tissue ◽  
Growth Period ◽  
Weather Conditions ◽  
Nutrient Content ◽  
Foliar Analysis ◽  
Fresh Weight ◽  
Hydroponic System ◽  
Nutrient Film Technique ◽  
Lettuce Growth ◽  
Strong Winds

In this study, the yield and growth performance of lettuce in an open-air rooftop hydroponic system were investigated. Lettuce was grown in a closed recirculating nutrient film technique (NFT) unit using a standard nutrient solution (NS). Yield, fresh weight, and nutrient content in the leaf tissue of the harvested lettuce were measured. The results were compared with the results obtained in indoor hydroponic lettuce growth with artificial lightning. Despite strong winds during the growth period, 25% of the total lettuce heads weighed twice the marketable weight; however, 25% of the total lettuce heads were below the marketable weight. A more efficient nutrient uptake was indicated by the lettuces in the rooftop system compared with the uptake in the indoor system. Foliar analysis revealed a higher content of all nutrients in the leaves of rooftop hydroponic lettuce compared with indoor hydroponic lettuce. This study suggests that hydroponic rooftop-grown lettuce can be competitive with their indoor counterparts if the rooftop hydroponic system is protected from extreme weather conditions.

scholarly journals Hydroponic Lettuce Cultivation Using Organic Nutrient Solution from Aerobic Digested Aquacultural Sludge

Agronomy ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1484
Author(s):  
Maha Ezziddine ◽  
Helge Liltved ◽  
Randi Seljåsen
Keyword(s):  
Nutrient Solution ◽  
Leaf Tissue ◽  
Mineral Fertilizer ◽  
Fresh Weight ◽  
Hydroponic System ◽  
Organic Nutrient ◽  
Marked Weight ◽  
Rich Solution ◽  
Lettuce Growth ◽  
Nutrient Solutions

The aim of this study was to demonstrate how aquacultural sludge can be processed and utilized as an organic nutrient solution (ONS) for hydroponic lettuce production. By using a previous developed method, approximately 80% of the processed sludge was reclaimed as a clear, nutrient-rich solution. The performance of the recovered nutrient solution on lettuce growth was assessed in a nutrient film hydroponic system. The results were compared to the results obtained using a conventional nutrient solution (CNS). Yield, fresh weight, water consumption, and nutrient and heavy metal content in leaf tissue were measured. In spite of a 16% lower average fresh weight obtained in ONS compared to the weight obtained in CNS, there was no statistical difference of the yield of lettuce among the two nutrient solutions. After the cultivation period, 90% of the lettuce heads grown in ONS exceeded the marked weight of 150 g. Foliar analysis revealed a similar or higher content of all nutrients, except of magnesium and molybdenum in the leaves of lettuce grown in the ONS compared to lettuce grown in the CNS. This study shows that nutrients recovered from aquacultural sludge can be utilized as fertilizer, thereby reducing the dependency on mineral fertilizer in hydroponic and aquaponic systems.

scholarly journals Hydroponic system for the treatment of anaerobic liquid

2012 ◽  
Vol 65 (7) ◽  
pp. 1164-1171 ◽  
Author(s):  
K. Krishnasamy ◽  
J. Nair ◽  
B. Bäuml
Keyword(s):  
Plant Growth ◽  
Oxygen Demand ◽  
Growth Period ◽  
Nutrient Content ◽  
Small Scale ◽  
Preliminary Evaluation ◽  
Nutrient Quality ◽  
Hydroponic System ◽  
Pre Treatment ◽  
High Chemical Oxygen Demand

The effluent from anaerobic digestion process has high concentrations of nutrients, particularly nitrogen, essential for plant growth but is not suitable for direct disposal or application due to high chemical oxygen demand (COD), low dissolved oxygen (DO), odour issues and is potentially phytotoxic. This research explored the optimum conditions of anaerobic effluent for application and dilutions of the effluent required to obtain better plant growth. A small-scale hydroponic system was constructed in a glasshouse to test different concentrations of anaerobic effluent against a commercial hydroponic medium as the control for the growth of silverbeet. It was found that the survival of silverbeet was negatively affected at 50% concentration due to low DO and NH4 toxicity. The concentration of 20% anaerobic liquid was found to be the most efficient with highest foliage yield and plant growth. The hydroponic system with 20% concentrated effluent had better utilisation of nutrients for plant growth and a COD reduction of 95% was achieved during the 50-day growth period. This preliminary evaluation revealed that the growth and development of silverbeet was significantly lower in anaerobic effluent compared with a commercial hydroponic plant growth solution. The nutrient quality of anaerobic effluent could be highly variable with the process and the waste material used and dilution may depend on the nutrient content of the effluent. It is recommended that, a pre-treatment of the effluent to increase DO and reduce ammonium content is required before plant application, and simple dilution by itself is not suitable for optimum plant growth in a hydroponic system.

scholarly journals A Comparison of Plant Growth Rates between an NFT Hydroponic System and an NFT Aquaponic System

Horticulturae ◽  
2019 ◽  
Vol 5 (2) ◽  
pp. 27 ◽  
Author(s):  
Lennard ◽  
Ward
Keyword(s):  
Plant Growth ◽  
Growth Rates ◽  
Green Plant ◽  
Ctenopharyngodon Idella ◽  
Petroselinum Crispum ◽  
Anethum Graveolens ◽  
Hydroponic System ◽  
Nutrient Film Technique ◽  
Grass Carp Ctenopharyngodon Idella ◽  
Lettuce Growth

A comparison of leafy green plant species’ (lettuce (Lactuca sativa L.), dill (Anethum graveolens L.), rocket (Eruca sativa), coriander (Coriandrum sativum L.), and parsley (Petroselinum crispum)) growth rates was performed between an Nutrient Film Technique (NFT)hydroponic system, using standard commercial nutrient solution, and an NFT aquaponic system, using fish waste from Grass Carp, (Ctenopharyngodon idella) which provided the majority of the nutrients required by the plants. The results demonstrated that the aquaponic method performed well, and, in many cases, the growth rates produced were similar to those of the hydroponic method. Lettuce growth was compared across three seasons (summer, winter, and spring), and, in all cases, the aquaponically-grown lettuce equalled, or bettered, the hydroponic equivalent. Herb growth was compared over a five-month period (February to June—summer/autumn), and in 17 out of 23 comparisons, the aquaponic method produced results similar to those of the hydroponic method. Thus, while the NFT method may not be the most appropriate technical approach for aquaponic integration, the results suggest that the overall aquaponic method has the potential to produce plant growth rates at least equal to those of standard hydroponics.

scholarly journals Ontogeny of beech seedlings in the first vegetation period in stand conditions

2002 ◽  
pp. 81-91 ◽  
Author(s):  
Martin Bobinac
Keyword(s):  
Growth Period ◽  
Weather Conditions ◽  
Vegetation Period ◽  
Biological Properties ◽  
Beech Forests ◽  
Vegetation Growth ◽  
Closed Canopy ◽  
Stand Conditions ◽  
Root Collar ◽  
Intensive Growth

The ontogenetic properties of moesian beech seedlings were analysed in the first vegetation growth period at identical sites, but in different stand conditions based on the divergent values of unique and complex biological characteristics. The seedlings were formed on the deluvium at the site of montane beech forests (Fagetum moesiacae montanum typicum Jov. 1976) on deep eutric brown soil. The terrain is gently sloped, exposure east-southeast, altitude about 470 m The seedlings from the completely closed part of the stand are the phenotype of the sciomorphic structural form. Their above-ground shoots usually consist of: hypocotyl, cotyledons (or their scars), above-cotyledon internode-epicotyl, a weak (leafless, as a rule), sylleptically formed "above-epicotyl axis", two opposite, primary, leaves and vegetative buds, large terminal and undeveloped in the axyl cotyledons and primary leaves Compared to the conditions in the closed canopy, seedlings on the felling area differ in some biological properties and form a different phenotype In the different environment conditions, the greater significance of differences between identical biological properties is expressed according to the order of their origin. The most expressed differences occur in the development of the "above-epicotyl axis". In the juvenile stage of ontogeny, in the conditions of more illuminated felling area, Moesian beech can form shoots with shortened or incomplete cycle of morphogenesis and thus it is ontogenetically adapted to site and weather conditions More intensive growth of the "above-epicotyl axis" of the seedlings on the felling area conditioned the averagely higher seedlings at the end of the first vegetation growth period, more numerous assimilation apparatus, larger diameter root collar, larger diameter of hypocotyl and epicotyl parts. The range between average effects of growth in closed stands and in felling area points to the development potentials of beech depending on the factors of ecological nature, which can be controlled, to some extent, by silvicultural measures.

scholarly journals Correlations between the Growth Period and Fresh Weight of Seed Sprouts and Pixel Counts of Leaf Area

2014 ◽  
Vol 39 (4) ◽  
pp. 318-323 ◽  
Author(s):  
Daesik Son ◽  
Soo Hyun Park ◽  
Soo Chung ◽  
Eun Seong Jeong ◽  
Seongmin Park ◽  
...  
Keyword(s):  
Leaf Area ◽  
Growth Period ◽  
Fresh Weight

scholarly journals Fertilization during the establishment of a Eucalyptus camaldulensis plantation in the northern Brazilian Amazon.

2012 ◽  
Vol 6 (2) ◽  
pp. 91
Author(s):  
Mirian Cristina Gomes Costa ◽  
Hélio Tonini ◽  
Carlos Tadeu dos Santos Dias ◽  
Bruna De Freitas Iwata
Keyword(s):  
Leaf Tissue ◽  
Eucalyptus Camaldulensis ◽  
Tree Height ◽  
Nutrient Content ◽  
Brazilian Amazon ◽  
Fractional Factorial ◽  
Sustainable Land Use ◽  
Phosphorus Fertilization ◽  
Planted Forests ◽  
Native Forests

Forestry plantations should be regarded as an alternative sustainable land-use system in degraded savannah areas. They contribute to the maintenance of productive processes in degraded soils that are of economic importance for local inhabitants; in addition, in the ecological sense, timber and non-timber products from planted forests reduce the exploitation pressure on native forests. Eucalyptus plantations on degraded savannahs in the northern Brazilian Amazon may help to reduce exploitation pressure on native forests. However, there is no information regarding the nutrients rates that would allow faster eucalyptus growth in that region. A trial was installed in an Yellow Latosol (Oxisol) soil type adopting a one-half-type fractional factorial design with four ates of N, P, and K. Functions were adjusted for the dependent variables height, diameter at breast height (DBH), leaf tissue nutrient content, and soil-chemical attributes. Interaction N versus K was observed on tree height with a maximum of 7.8 m recorded at 200 kg ha-1 of N and 50 kg ha-1 of K. Phosphorus fertilization promoted greater DBH growth with maximum value at 120 kg ha-1 of P; however, the highest gain was obtained at 30 kg ha-1 of P. The NPK rates that maximized Eucalyptus camaldulensis growth were 200, 30, and 50 kg ha-1, respectively.

Effects of Soil pH on Competitive Ability and Leaf Nutrient Content of Corn (Zea maysL.) and Three Weed Species

Weed Science ◽  
1985 ◽  
Vol 33 (4) ◽  
pp. 447-451 ◽  
Author(s):  
Susan E. Weaver ◽  
Allan S. Hamill
Keyword(s):  
Soil Ph ◽  
Competitive Ability ◽  
Leaf Tissue ◽  
Dry Weight ◽  
Nutrient Content ◽  
Setaria Viridis ◽  
Weed Species ◽  
Field Corn ◽  
Green Foxtail ◽  
Companion Plant

Effects of soil pH on growth, competitive ability, and leaf nutrient content of corn (Zea maysL.), Powell amaranth (Amaranthus powelliiS. Wats. ♯ AMAPO), velvetleaf (Abutilon theophrastiMedic. ♯ ABUTH), and green foxtail [Setaria viridis(L.) Beauv. ♯ SETVI] were measured in the field. Corn yields were significantly reduced by weed competition at all pH levels, but leaf nutrient content, as a percentage of dry weight, was not affected. Aboveground dry weights of Powell amaranth and velvetleaf were significantly lower at pH 4.8 than at pH 6.0 or 7.3, whereas growth of green foxtail was greater at pH 4.8 than at pH 7.3. Weed competitive ability, as evidenced by reductions in dry weight, varied with soil pH and companion plant. Powell amaranth and velvetleaf had higher levels of S, Zn, and especially Mn, at pH 4.8 than at pH 7.3. N and K in the leaf tissue were greater in the weed species than in corn at all soil pH levels. The dicot species had higher percentages of Ca and Mg in leaf tissue at all soil pH levels and accumulated higher percentages of Mn at low pH than the monocot species.

Hydroponics reducing effluent's heavy metals discharge

2009 ◽  
Vol 59 (1) ◽  
pp. 175-183 ◽  
Author(s):  
Abdellah Rababah ◽  
Ahmad Al-Shuha
Keyword(s):  
Heavy Metals ◽  
Removal Efficiency ◽  
Value Added ◽  
Treated Wastewater ◽  
Hydroponic System ◽  
Heavy Metals Removal ◽  
Treated Effluent ◽  
Metals Removal ◽  
Nutrient Film Technique ◽  
Removal Efficiencies

This paper investigates the capacity of Nutrient Film Technique (NFT) to control effluent's heavy metals discharge. A commercial hydroponic system was adapted to irrigate lettuces with primary treated wastewater for studying the potential heavy metals removal. A second commercial hydroponic system was used to irrigate the same type of lettuces with nutrient solution and this system was used as a control. Results showed that lettuces grew well when irrigated with primary treated effluent in the commercial hydroponic system. The NFT-plant system heavy metals removal efficiency varied amongst the different elements, The system's removal efficiency for Cr was more than 92%, Ni more than 85%, in addition to more than 60% reduction of B, Pb, and Zn. Nonetheless, the NFT-plants system removal efficiencies for As, Cd and Cu were lower than 30%. Results show that lettuces accumulated heavy metals in leaves at concentrations higher than the maximum acceptable European and Australian levels. Therefore, non-edible plants such as flowers or pyrethrum are recommended as value added crops for the proposed NFT.

Sign in / Sign up

Export Citation Format

Share Document